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    4. var arr = [10,15,2,32,5,4,20,8,48,54,6];找出数组中小于10 的数据，并组成一个新的数组
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<script>
    var arr = [10, 15, 2, 32, 5, 4, 20, 8, 48, 54, 6]
    var arr1 = []
    for (i = 0; i < arr.length; i++) {
        if (arr[i] < 10) {
            arr1.push(arr[i])
        }
    }
    console.log(arr1)
</script>

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